Yes! If you want to re-send the email invite to a client, just follow the same steps you followed the first time!
1. Click Send
While in the trip, click on the blue Send button in the top right corner!
2. Click Email Invite Clients
Once you've clicked on Send, some options will appear. Click on Email Invite Clients
3. Send email
A box will appear allowing you to put in the client's email address. Fill out the form and add a custom message, and click Send Email!